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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ac71af835c7792e6f60b8b53ae18a51eafe42f1af3e214f8ea94eb4ca18f45' 
  AND token = '1PC8qQvHnaelp4o7uFaFrepnaMr4qy4k/wS7yenKLOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}